IEC 61557-10:2024

IEC 61557-10 ®
Edition 3.0 2024-10
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Electrical safety in low voltage distribution systems up to 1 000 V AC and
1 500 V DC – Equipment for testing, measuring or monitoring of protective
measures –
Part 10: Combined measuring equipment for testing, measuring and monitoring
of protective measures
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IEC 61557-10 ®
Edition 3.0 2024-10
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Electrical safety in low voltage distribution systems up to 1 000 V AC and
1 500 V DC – Equipment for testing, measuring or monitoring of protective
measures –
Part 10: Combined measuring equipment for testing, measuring and monitoring
of protective measures
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-8322-9833-6
– 2 – IEC 61557-10:2024 CMV © IEC 2024
CONTENTS
FOREWORD .3
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Requirements .6
4.1 General .6
4.2 Extraneous overvoltage withstand capability .7
4.3 Performance after application of extraneous overvoltage .7
5 Marking and operating instructions .8
5.1 General .8
5.2 Marking and Pictogram .8
6 Tests .9
Bibliography . 10
List of comments . 11

Figure 1 – Maximum distribution system voltage marking.8
Figure 2 – Example of a pictogram for a 500V AC system .9

Table 1 – Extraneous overvoltage withstand capability .6

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO
1 000 V AC AND 1 500 V DC – EQUIPMENT FOR TESTING, MEASURING OR
MONITORING OF PROTECTIVE MEASURES –

Part 10: Combined measuring equipment for testing, measuring or and
monitoring of protective measures

FOREWORD
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This commented version (CMV) of the official standard IEC 61557-10:2024 edition 3.0
allows the user to identify the changes made to the previous IEC 61557-10:2013
edition 2.0. Furthermore, comments from IEC TC 85 experts are provided to explain the
reasons of the most relevant changes, or to clarify any part of the content.
A vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text. Experts' comments are identified by a
blue-background number. Mouse over a number to display a pop-up note with the
comment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.

– 4 – IEC 61557-10:2024 CMV © IEC 2024
IEC 61557-10 has been prepared by IEC technical committee TC85: Measuring equipment for
electrical and electromagnetic quantities. It is an International Standard.
This third edition cancels and replaces the second edition published in 2013. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The scope has been updated to include the combination of measuring functions covered by
the IEC 61557 series with those not covered by the IEC 61557 series.
b) Reasonably foreseeable misuse is now considered.
c) An exemption has been added for terminals that can only be accessed by use of a tool.
d) Table 1 has been updated for clarification.
e) The voltage source used for the overload test takes into account the expected short-circuit
currents for measurement categories in accordance with IEC 61010-2-030:2017.
The text of this International Standard is based on the following documents:
Draft Report on voting
85/887/CDV 85/914/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This International Standard is to be used in conjunction with IEC 61557-1:2019.
A list of all parts of the IEC 61557 series, published under the general title Electrical safety in
low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing,
measuring or monitoring of protective measures, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
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ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO
1 000 V AC AND 1 500 V DC – EQUIPMENT FOR TESTING, MEASURING OR
MONITORING OF PROTECTIVE MEASURES –

Part 10: Combined measuring equipment for testing, measuring or and
monitoring of protective measures

1 Scope
This part of IEC 61557 specifies the requirements for combined measuring equipment that
combines several measuring functions or methods of testing, measuring or monitoring, that are
in accordance with the respective parts of IEC 61557, into one piece of apparatus.
Measuring equipment which combines measuring functions or methods of testing, measuring
or monitoring covered by the respective parts of IEC 61557 with those not covered by the
respective parts of IEC 61557 is also within the scope of this document. 1
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61557-1:2019, Electrical safety in low voltage distribution systems up to 1 000 V AC and
1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 1:
General requirements
IEC 61557-2, Electrical safety in low voltage distribution systems up to 1 000 V AC and
1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 2:
Insulation resistance
IEC 61557-3, Electrical safety in low voltage distribution systems up to 1 000 V AC and
1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 3:
Loop impedance
IEC 61557
...